Question

A motorist took 2 hours to travel from Town A to Town B. His averagespeed for the whole journey was 60 km/h. For the first of the jour-ney, he travelled at an average speed of 70 km/h. Find his averagespeed for the remaining journey.

Answer 1

Given:

Average Speed of the whole jouney is 60 km/hr

At first he travelled at an average speed of 70 km/hr

Average speed of remaining journey be x km/hr

`\begin{gathered} 60=(70+x)/(2) \\ 60*2=70+x \\ 120=70+x \\ x=120-70 \\ x=50\text{ km/hr} \end{gathered}`

Therefore, average speed of remaining journey be 50 km/hr